Adjustable sight mount for firearms



33-258m 0R zweamh Ram July 11, 19,39. BURTON 2,165,785

" ADJUSTABLE SIGHT MOUNT FOR FIREARMS Filed April 9, 1937 2 Sheets-Sheet 1 kn w/ax 54/71" Fizz/v 0:

W M-Q,

65. ULUIVILIHILJAL INDIHUIVIENIJB.

Q 9 v march Hmm 53a 7 July 11, 1939. F. F. BURTON 2,165,735

ADJUSTABLE SIGHT MOUNT FOR FIREARMS Filed April 9, 1937 2 Sheets-Sheet 2 dearth fiddfti 2,165,785

Patented July 11, 1939 UNITED STATES PATENT OFFICE ADJUSTABLE SIGHT MOUNT FOR FIREARMS Frank F. Burton, Mount Carmel, Conn., assignor, by mesne assignments, to Western Cartridge Company, a corporation of Delaware Application April 9, 1937, Serial No. 135,969

7 Claims. (01. 33--56) ing-nut of the adjusting-mechanism of the elevation-slide;

Fig. 14 is a similar view of the tensioningspring of the adjusting-mechanism of the elechanges in range, etc., and lateral adjustment to vation-slide; and 5 compensate for various wind velocities. t t 1131g. 1511st a pirhspeftgve VleWb of the endor One of the objects of the present inven ion is a e-up p a e 0 e 0 y-mem er. to provide a superior adjustable sight-mount of The particular adjustable sight-mount herein the type described, and characterized by simchosen for illustration includes a body-member,

" plicity, reliability and efiectiveness. generally designated by the numeral 20, and 10 A further object is to provide a superior adcomprising a body-head 2| and a forwardly-exjustable sight-mount of the character referred tending body-tang 22, which latter is provided to, in which lost motion is eliminated or so mini- E5132 321$: 12321325302 wig: avhorizgngalldoligimzed as to ne-ghglb tudin 11 d'ust bl an r s 15 Another object is to piovide a superior sight at y a J a e W e p t t a Suitable mount f th hara t referr d t which may be dovetail lug or rib (not shown) upon the receiver readily and conveniently adjusted in either direcor other sultabie P of a firearm tion to definite settings. the Purpose Of adJlls bly locklng the body-memher in place upon such a dovetail rib the body- With the above and other ob ects in view, as

'20 will appear to those skilled in the art from the gi a i g lwlth two ztshumb'screws following disclosure, this invention includes all a er 6 pug-screw Apphed to the rear end of the body-head 2| features in the said disclosure WhlCh are novel th m r art and which are not claimed by 1s an endor take-up plate 26 WhlCh provides an Over. 8 p Crate a 1i cation adjustable rear wall for a dovetail groove 2'! exme m Sepa tending vertically through the right or inner face 25 In the accompanying drawings, in which cerf ut the resent invention or the said body-head. The said dovetail groove tam g fif g p ur 21 receives, with capacity for vertical sliding g i f n movement, the vertical arm 28 of an elevation- 1 VIEW m 16 '5 z 2 t 1 slide, designated as a whole by the numeral 29,

-30 iusteible S1g ht'm0un.t em 0 Y e P n and of substantially L-shaped form. The said 30 Ventmn with the mtermefilate pormon of the elevation-slide also includes a horizontal arm 30 bmken w extending to the right from the upper end of the Fig. 2 1s a broken view thereof in right-side Vertical arm elevatlon' with the forward pornon of the body" The vertical arm 28 of the elevation-slide is of member Pmken away; dovetail form in horizontal section, as particu- 35 3 top plan Vlew of the rear Portion larly well shown in Figs. 8 and 9, to accurately of t e Sig 'moun 5 fit the dovetail groove 21 in the body-head 2|.

4 is a View f in flront'eitidkeievatiitifi5 As before noted, the endor take-up plate 26 5 is a Vertical Sec 1011a View a en on 8 provides the rear wall of the groove 21, just reline of 1; ferred to, and for the purpose of insuring against 40 6 is a Similar View taken on the line looseness, the inner edge of the said plate 26 may of Fig. 1; be adjusted toward the adjacent edge of the Fig. '7 is a vertical sectional view taken on the arm 28 by means of two (more or less) take-up line O F screws 3l-3l (Fig. 1). As shown particularly 45 Fig. 8 is a horizontal View taken on the line w ll in Figs. 8, 9 and 15, the outer edge of the 45 -88 of Fig. 5; 1 endor take-up plate 26 is provided with a ver- Fig. 9 is a horizontal sectional view taken on tical fulcrum-rib 32 bearing against the rear the line 9-9 of Fig. 6; edge of the body-head 2| and providing a ful- Fig. 10 is a perspective view of the windagecrum upon which the plate 26 may be rocked by slide; the take-up screws 3|--3I. 5

Fig. 11 is a perspective view of the windage- The elevation-slide 29 is formed with a finger slide take-up spring; 3 offsetting to the left from the upper end of the Fig. 12 is a similar view of one of the adjustarm 28 and in effect forming a continuation of ing-screw heads; the oppositely-extending horizontal arm 30 of I Fig. 13 is a perspective view of the tensionthe said slide. The finger 33, when the eleva- 55 tion-slide is in its depressed position, lies within an upwardly-opening transverse notch 34 formed in the adjacent upper edge of the body-head 2|. At its lower end, the arm 28 is formed with a finger 35 offsetting in the same direction as the finger 33, before referred to, and accommodated within a vertically-extending groove 36 formed in the inner or right face of the body-head 21 and intersecting the lower end thereof.

The upper wall of the groove 36, above referred to, constitutes in effect a threaded nut 31 into which is threaded the shank of a verticallyextending elevation-adjusting screw 38. The said screw 38 extends at its lower end through an unthreaded bearing-passage 39 in the finger 35 of the slide and has a kerfed head 40 bearing against the under-face of the said finger. The upper portion of the said elevation-adjusting screw passes through an unthreaded bearingpassage 4| formed in the finger 33 of the elevation-slide and into threaded engagement with the lower portion of a threaded bore 42 formed in a knurled adjusting-head 43. Threaded into the upper portion of the bore 42 in the said adjustinghead 43 is a headless kerfed binding-screw 44 which impinges against the upper end of the elevation-adjusting screw 38 and serves to firmly lock the latter to the said adjusting-head.

The under-face of the adjusting-head 43 is formed with an annular series of downwardlyopening detent-recesses 45, each of which is adapted to be brought into registration with the rounded upper end of a detent-plunger 46 mounted for vertical reciprocation in an upwardlyopening cylindrical pocket 41 formed in the elevation-slide 29 adjacent the junction of its vertical and horizontal arms 28 and 30 respectively. The said detent-plunger is, as shown in Figt'fi, pressed upwardly by a helical spring 48 located in the lower end of the pocket 41.

For the purpose of insuring the threaded connection of the elevation-adjusting screw 38 with the body-head 2 I, without axial backlash or play, there is mounted upon the said elevation-adjusting screw, immediately below the nut-like portion 31 of the body-head, a dished sheet-metal tensioning-spring 49 having a straight edge 50 which has sliding engagement with the adjacent face of the arm 28 of the adjusting-slide 29. Bearing against the under-face of the tensioningspring 49 is a tensioning-nut having a threaded bore 52 receiving the elevation-adjusting screw 38 and having opposite fiat edges 5353, either of which may be in sliding engagement with the adjacent inner face of the vertical arm 28 of the elevation-slide 29, so as to restrain the said tensioning-nut against rotation. As will be noted by reference to Fig. 6 in particular, both the tensioning-spring 49 and the tensioning-nut 5| are accommodated within the groove 3'6 in the bodyhead 2|.

After the elevation-adjusting mechanism, just above described, has been assembled with the washer-like tensioning-spring 49 placed under the desired degree of tension, the elevation-adjusting screw 38 and its adjusting-head 43 are threaded together until the upper face of the head 46 and the lower face of the adjusting-head 43 are firmly seated respectively against the under-face of the finger 35 and the upper face of the finger 33, whereupon the binding-screw 4 4 is screwed inwardly into firm engagement with the upper end of the shank of the elevation-adjusting screw 38, to thereby firmly lock the latter to the adjusting-head 43.

For the purpose of conveniently gauging the vertical position of the elevation-slide 29, the left face of the body-head 2| is provided, as shown in Fig. 1, with a vertically-arrangedseries of indicia 54 providing an elevation scale which is readable in conjunction with the pointed terminal of a forwardly-bent pointer-arm 55 of a sheetmetal elevation-indicator, generally designated by the numeral 56. The said elevation-indicator 56 extends to the right across the end-plate 26 and thence forwardly part way across the inner or right face of the vertical arm 28 of the elevation-slide 29 to which latter it is secured with capacity for slight vertical adjustment by a clamping-screw 51. To prevent the possible canting of the elevation-indicator 56, the end thereof opposite its pointer 55 is turned inwardly to form a guide-flange 58 snugly fitting a guide-groove 59 formed in the inner or right face of the arm 28 of the slide.

For the purpose of further assisting the marksman in adjusting the elevation-slide 29, the periphery of the hub-portion 66 of the adjustinghead 43 of the elevation-adjusting screw 38 is provided with an annular series of indicia corresponding in number to the number of detentrecesses 45. v

The horizontal arm 30 of the elevation-slide 29 provides mounting-means for a windage-slide. The said horizontal arm or mounting-member for the Windage-slide is bifurcated, as shown particularly well in Figs. 3, 8 and 9, by a notch-like guide-way 6| which is cylindrically contoured in cross-section and may be conveniently produced by a drilling or milling operation. Extending into the notch-like guide-way 6|, just referred to, with capacity for reciprocating movement free of the side walls thereof, are the cylindrically-contoured central portions of two spacedapart resilient arms 62 and 63 offsetting from a horizontally-adjustable windage-slide, generally designated by the numeral 64. The said windageslide is provided with a threaded passage 65, which itself may be used as a peep-sight or, if desired and as shown, may receive the externally-threaded tubular shank 66 of a peep-disk 61.

The windage-slide 64 is shaped to provide oppositely-extending horizontal bearing-shoulders 68--'68 which are adapted to slide along the under-face of the horizontal arm 30 of the elevation-slide 29 and are held in snug engagement therewith by a sheet-metal tensioning-spring, generally designated by the numeral 69, and which is of substantially U-shaped form. Said tensioning-spring comprises two spaced-apart arched arms 18-40 adapted to straddle the resilient arms 62, 63 of the windage-slide 64, and to bear both against the upper face of the arm 30 of the windage-sli-de 29 and the under-faces of the T-shaped terminals 1|, 12 of the said resilient arms 62, 63. The arched arms 1fl10 of the spring are integrally connected together by a side-bar 13 which is adapted to rest against the outer face of one of the arms '62 or 63, while the outer face of the other of such arms is engaged by the retaining-fingers 14-14, one of which latter is formed at the extremity of each of the said arms -10.

As thus constructed and arranged, the tensioning-spring 69 serves to prevent the canting of the windage-slide 64 with respect to the elevationslide, and assures that the windage-slide will accurately travel in a predetermined path. Each of the resilient spaced-apart arms 62, 63 of the windage-slide 64 is provided with a threaded bore UlLUH/iLIIHUHL.

15, and in effect each of the said arms constitutes a nut-portion in threaded engagement with both of which is a windage-adjusting screw 16. The respective arms 62, 63 have their bores threaded as described, and after such threading operation, the said arms are displaced with respect to each other in a direction substantially parallel with the axes of the said bores, so that all backlash between the windage-slide B4 and the said screw 16 is taken up. The displacement of the arms 62, 63, just referred to, may be either toward or away from each other and produces in effect the same result as that obtained by the tensioning-spring 49 in urging the tensioningnut 5| away from the integral nut-like portion 31 of the body-head 2 I.

The windage-adjusting screw 16 is formed at one end with an integral kerfed head 11 which is formed in its inner face with a conical recess 18 (Fig. 8), which receives conically-contoured lips 1919, one of which is formed upon the arm 30 on each of the respective opposite sides of the guide-way 6| therein. The head 11 is also recessed into the end of the said arm 30, as shown, and by virtue of its conical recess 18 engaging with the lips 19-19, the material forming each of the opposite sides of the guide-way BI is prevented from spreading or other displacement.

The windage-adjusting screw turns in an unthreaded bearing-passage 80 formed in the elevation-slide 29 and is threaded into the inner portion of a threaded bore 8| formed in a knurled adjusting-head 82 having a hub 83 provided upon its periphery with an annular series of indicia for the purpose of aiding in the adjustment of the windage-slide -fid. After the head 11 has been seated against the adjacent portion of the arm 30 of the slide 29 and the inner face of the adjusting-head 43 has been similarly seated against the outer face of the finger 33 of the said slide, a headless kerfed plug-screw 84 is threaded into the outer end of the threaded bore 8| in the said adjusting-head and firmly seated against the adjacent end of the windage-adjusting screw 16.

The adjusting-head 82 corresponds in all essential respects to the adjusting-head 43, before described, and like the same is provided in its inner face with an annular series of conical detentrecesses 85 receiving the rounded outer end of a detent-plunger 86 reciprocating in a pocket 8'! formed in the slide 29 just to the rear of the screw H3. The said detent-plunger 86 is urged outwardly by a helical spring 88 located in the inner portion of the said pocket 81, as clearly shown in Fig. 8.

As shown particularly well in Figs. 3 and 7, the horizontal arm 30 of the elevation-slide 29 has clipped over its forward edge a U-shaped sheetmetal windage-scale 89 secured in place by a screw 90 and having a series of graduations thereon with which is adapted to register an indexmark 9| on the upper face of the adjacent arm of the take-up spring 69.

In the structure above described, the elevationslide 29 provides a mounting-member for the windage-slide 64 and in turn the body provides a mounting-member for the said elevation-slide 29.

If desired and as indicated by broken lines in Fig. 4, the windage-slide, instead of depending from the horizontal arm of the elevation-slide, may be reversed to bring the threaded passage 65 therein in a plane above the part 30 just referred to.

By reference to the drawings and the foregoing Search Racer description, it will be seen that the present invention as illustrated herein provides an adjustable sight in which backlash or play has been practically eliminated, both as-to the elevationadjusting feature and the windage-adjusting fea- 5 ture, so that when either of the adjusting-screws 38 or 16 is turned in either direction, an instant and commensurate response is had from the part or parts being adjusted. Thus, for instance, if the user of the sight has turned the elevation-adjusting screw 38 to effect the upward movement of the elevation-slide 29, and should later decide that this elevation had been excessive, a slight reverse turning of the elevation-adjusting screw 38 will serve to effect the instant and proper degree of depression of the elevation-slide 29. In other words, the elevation-adjusting screw 38 does not require that it be turned in a reverse direction a considerable distance before it can effect the reverse movement of the slide 29. elimination of lost motion is provided for the windage-slide 64 by the windage-adjusting screw 16 and associated parts.

The invention may be carried out in other specific ways than those herein set forth without departing from the spirit and essential characteristics of the invention, and the present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, and all changes coming within the meaning and equivalency range of the appended claims are intended to be embraced therein.

I claim:

1. An adjustable sight-mount for firearms comprising: a mounting-member; a slide member; sight-means carried thereby; and adjustingmeans constructed and arranged to shift the said slide-member and sight-means with respect to the said mounting-member and including an adjusting-screw and two complementary nut-like elements associated with the slide-member, one at least of which is in the form of a resilient arm, and both of the said nut-like portions being in threaded engagement with the said adjustingscrew under substantially constant axial tension and resiliently displaced with respect to each other along the axis of the said adjusting-screw, whereby the threads thereof are continuously forced into engaging relation to the threads of the adjusting-screw.

2. An adjustable sight-mount for firearms comprising: a mounting-member having two spaced-apart arms, each provided with a conically-contoured projection at a head-engaging end thereof; a sight-carrier adjustably carried by the said mounting-member; and adjustingmeans constructed and arranged to shift the said carrier with respect to the said mounting-member and including an adjusting screw extending between the spaced-apart arms of the said mounting-member and having two opposed heads spaced from each other and respectively seated against oppositely-facing portions of the sightstructure, one of the said heads being threaded to the said adjusting-screw and helically adjustable with respect thereto, and locking-means constructed and arranged to lock the last mentioned head against rotation relative to the said adjusting-screw; one of the said heads being provided with a conically-contoured recess receiving the conically-contoured projections of the spaced-apart arms of the said mountingmember to restrain the said arms against separation.

3. An adjustable sight-mount for firearms The same comprising: a mounting-member having a bifurcated portion providing a guide-way formed by and between two parallel fingers, each of the said fingers being provided with a retaining-lip at one terminal thereof; a sight-carrier mounted with capacity for reciprocation in the guide-way formed by the said fingers; and an adjustingscrew extending longitudinally of the guide-Way in the said mounting-member and having a head provided with an annular recess in its inner face and fitting over the retaining-lips of the parallel fingers of the said mounting-member.

4. An adjustable sight-mount for firearms comprising: a mounting-member having a bifurcated portion providing a guide-way formed by and between two parallel fingers, each of the said fingersbeing provided with a comically-contoured retaining-lip at one terminal thereof; a sight-carrier mounted with capacity for reciprocation in the guide-way formed by the said fingers; and an adjusting-screw extending longitudinally of the guide-way in the said mountingmember and having a head provided with a conically-contoured annular recess in its inner face and fitting over the conically-contoured retaining-lips of the parallel fingers of the said mounting-member.

5. An adjustable sight-mount for firearms comprising: a body comprising a head-portion having a vertical guide-way therein and a relatively long and slender tang-portion extending horizontally forwardly from the said head-portion the said tang-portion depending vertically and being provided with a horizontal groove constructed and arranged to slidably receive a horizontal mounting-lug upon a firearm structure; locking-means for locking the said tangportion to the firearm structure; an L-shaped elevation-slide having one arm vertically adjustable in the aforesaid guide-way in the headportion of the body and its other arm projecting substantially horizontally across the firearm structure in a direction substantially perpendicular to the direction in which the tang-portion of the said head-portion extends; and a windageslide carried by the substantially-horizontal arm of the said elevation-slide with capacity for horizontal adjustment with respect thereto.

6. An adjustable sight-mount for firearms comprising: a body-head; a slide-member shiftable with respect to the body-head; sight-means carried by the slide-member; and adjustingmeans operatively-connected with the slidemember and including an adjusting-screw and two complemental nut-like elements having threaded engagement with the adjusting-screw and being resiliently spaced apart along the said adjusting-screw, the said adjusting-screw and nut-like elements cooperating to cause sliding movement of the said slide-member, at least one of the said nut-like elements being associated with the said slide-member and being maintained thereby relatively-stationary with respect to the other nut-like element when the adjusting-screw is turned; at least the said one of the said resiliently-spaced-apart nut-like elements being under substantially constant axial tension urging it axially on the adjusting-screw with respect to the other nut-like element; whereby the threads of the said nut-like elements are maintained in closely-engaging relation to the threads of the adjusting-screw, and sensitive adjustment of the slide-member by the said adjusting-means operatively-connected therewith, is secured.

7. An adjustable sight-mount for firearms comprising: a body-head; a slide-member shiftable with respect to the said body-head; sightmeans carried by the slide-member; and adjusting-means operatively-connected with the slidemember and including an adjusting-screw, two nut-like elements having threaded engagement with the adjusting-screw, and a laterally-distortab le tension-spring mounted between and engaging adjacent faces of the nut-like elements to resiliently space the nut-like elements apart along the adjusting-screw, the said adjustingscrew and nut-like elements cooperating to cause sliding movement of the said slide-member, one of the said nut-like elements being engaged by the said slide-member and maintained thereby relatively-stationary with respect to the other nutlike element when the adjusting-screw is turned, and the said laterally-distortable spring acting on the said one of the nut-like elements to maintain it under constant axial tension and to urge it axially on the adjusting-screw with respect to the other nut-like element; whereby the threads of the said nut-like elements are maintained in closely-engaging relation to the threads of the said adjusting-screw, and sensitive adjustment of the said slide-member by the adjusting-means operatively-connected therewith, is secured.

FRANK F. BURTON. 

